Gas-lamp.



J. LEDERER.

GAS LAMP.

' APPLICATION FILED MAR. I. 1912.

Patented Apr. 25, 1916.

WITNESSES:

A TTOR/VEY 'rmz COLUMBIA PLANoanAmi co., wAimNc'mN, b. ::v

J'OSECPI-I LEDERER, OF NEW YORK, N. Y.

GAS-:LAMP.

Specification of Letters Patent.

Patented Apr. 25, 191 8.

Application filed March 1, 1912. Serial No. 681,007.

To all whom it may concern Be it known that I, JosErI-r LEDERER, a citizen of the United States, and a resident of the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Gas- Iiamps, of which the following is a full clear, and exact description.

My invention relates to an improvement in gas lamps of the type known as inverted incandescent arc lamps, and it particularly relates to that class of lamp having a single incandescent burner.

The objects of the present invention are variously to improve the construction and organization of the lamp, to increase its lighting efficiency, gas economy and ease and cheapness of construction. To this end the invention lies in certain improvements in the mixing arrangements and various improvements in the structure of the casing, burner and chimney supports, all of which will be fully set forth hereinafter and particularly pointed out in the claims.

Reference is now had to the accompanying drawings, which illustrate, as an example, the preferred manner of constructing the lamp.

In these drawings-Figure 1 is a vertical central section showing the lamp complete;-

Fig. 2 is a perspective view of the top of the lamp, particularly illustrating the gas check and shutter.

The main frame part of the lamp consists in a sheet metal barrel or casing, which, partly for purposes of ornamentation and partly for utilitarian purposes, is flared at each end and is formed of sections 10 and 11 united by a seam 12. Both sections are preferably drawn up in dies from ductile sheet metal. The first portion of the drawing process results in a cup-shaped formation and in the case of the upper section 10, the bottom of this cup is cut out to leave the casing open interiorly. In the case of the lower section, however, the bottom is not cut away, but is left intact diametrically across the section to produce the bridge 14. 1 At each side of this bridge the metal is stamped up to form wings or deflectors 15. This, it will be perceived, results in a distinct saving in metal and workmanship. The openings left inclination of the by the deflector wings 15 allow the draft currents to. pass upward and the deflector wings throw such currents outward, owing to the wings, so that the hot gases are caused to pass quickly from the casing through openings 16 provided for that purpose. The virtue of quickly dispos ing of the heated gases of combustion will fully appear hereinafter. At its top, the upper sectionlO of the casing has a bridge 17 similar to the bridge 14 and with integral deflector wings 18 similar to the Wings 15. This bridge 17, however, is not integral with the upper section, but has its ends riveted or otherwise fastened thereto. The wings 18 serve also to deflect the hot laterally away from the mixing which will now be described.

The mixing devices and the burner proper extend through the bridges 17 and 14, which serve to support them in addition to the function of bracing the casing itself. My experiments have taught me that in this class of lamp where the flame is below the mixing device, tending highly to heat the same, the most eflicient construction is that which most effectively protects the mixing devices from the heat, allowing the mixture to be formed when the air and gas are at the lowest possible temperature. The absence of this provision has been the greatest disadvantage heretofore encountered in inverted gas lamps. My present invention seeks to remove this difliculty. In attaining this end, I locate the gas check 19 on top of an upwardly flaring tube 20. The top of this tube is furnished, first, with a screen 21, above which is fastened by reaming or otherwise, a ported plate 22 and over this in turn lies a ported rotatable plate or air shutter 23 furnished with a finger piece or handle 24, so that it may be turned readily, thus opening or closing the air admission ports which lead into the top of the protector 20. This rotating shutter 23 is held in place by the check 19, which itself is fastened in the ported plate or top 22 0f the shield 20. The check 19 is a valve device which serves to control the amount of gas admitted from the nipple 19 of the check, while the air shutter serves ,to regulate the amount of atmospheric air admitted to the mixture.

devices,

gases Y The Bunsen or mixing tube 25 has at about its middle, threads which screw into corresponding threads in the reduced lower end of the tapering shield 20. The upper part of this tube is comparatively reduced and is of su'l'licient length to extend up into close proximity to the nipple 19 of the check, and is directly in line therewith, the upper end of the tube 25 being slightly flared to facilitate the entry of the mixing air and gas. The lower part of the Bunsen tube is enlarged to the size of the lower extremity of the shield 20 and carries this diameter downward to the bridge 14. Immediately below the bridge, however, the Bunsen tube is again enlarged to form a shoulder 25*, which bears against the underside of thebridge 14. Therefore, by screwing together the shield 20 and the Bunsen tube 25, the flared upper end of the shield is brought down firmly. on the bridge 17 and the shoulder 25is forced up firmly against the under side of the bridge 14. This makes a perfectly rigid structure and to prevent rotation of theseparts in the bridges and the consequent disturbance of the proper adjustment of the lamp, I provide the shield 20 with two protuberances 20", which fit into corresponding notches 17 in the bridge 17. This forms a lock when the parts are drawn together and prevents persons when assembling or mounting the lamp fromdisturbing the proper adjustment of the parts. The enlarged or flaring lower end of the Bunsen tube carries the usual screen 26 and below this the tube is threaded to carry the refractory tip 27 which in turn'su'stainsthe mantle 28, the same hanging pendant from the tip, as is the practice in this type of lamps. The flaring lower end of the casing is formed with orifices 29 for the admission of air to support combustion outside of the mantle, and just above these orifices an annular plate 30 is fastened into the casing and is notched on its inner edge to admit of entering within the plate a flaring glass chimney 31, which is thereby supported from the plate 30. This chimney extends down from a point above the air, inlet openings 29 to a point below the mantle 28 as the drawings show. The extreme lower end of the casing is fitted with screws 32 to sustain the globe 33,. according to the usual practice. This 7 globe is completely closed, excepting, of

course, for its open upper end, which is within the case.

In the operation of the lamp the gas flow is properly regulated by the check 19 and the air flow by the shutter 23. so that the -mixing air and gas enter the flaring upper endof the shield 20, the air being drawn in by the gas flow according to the Bunsen principle. The mixture thus formed enters the top of the Bunsen tube. The space within the shield 20 below the top of the Bunsen tube is a dead-air or insulation space. The mixture flows down into the Bunsen tube into the burner and being there ignited, burns. This produces an upward draft through the casing of the lamp and air is thereby drawn in through the openings 29 and down between the chimney 31 and globe 33 returning upward within the chimney to supply additional oxygen to the flame. This produces a most intense heat and, by reason of the employment of the Welsbach mantle, a perfect illumination. The hot gases of combustion pass up outside of the Bunsen tube through the chimney 31 and into the lower part of the casing. There they strike the wings 15 and are largely thrown out into the atmosphere through the opening 16. Such gases as escape this action pass out the top of the casing and are thrown sidewise by the wings 18. This allows me to gather in the flaring upper end of the shield 20 comparatively cool atmospheric air. Ordinarily this air, the instant it enters the lamp, would become highly heated, but by reason of the shield 20 with its dead-air space and with its prolonged Bunsen tube 25 reaching up near the check, the cooled air is protected from the heat of the lamp, and 1 am enabled to form in the upper end of the Bunsen tube a Bunsen mixture at a low temperature which, it is well known, is highly conducive to gas efiiciency in this type of burner.

This lamp may, like others of its general class, be fitted with a pilot light, which, however, I have not illustrated, since I make no claim thereon.

Having thus described my invention, what I do claim and desire to secure by Letters Patent of the United States is:

1. A gas lamp having a casing with two bridges across it and mixing and burner devices extending through the bridges, such mixing and burning devices comprising two sections movable toward and from each other to clamp them against the bridges, one part of said mixing and burning devices having interlocking engagements with one of the bridges to prevent relative rotation of the casing and mixing and burning devices.

2. An inverted gas lamp having a casing, two bridges extending across the same, a tubular shield extending through one of the bridges, a Bunsen tube extending through the other bridge and projected into the shield to a point near the top thereof and air and gas controlling devices at the top of the shield.

8. An inverted gas lamp having a casing, two bridges extending across the same, a

tubular shield extending through one of the I bridges, a Bunsen tube extending through the other bridge and projected into the shield to a point near the top thereof and name to this specification in the presence of air and gas controlling devices at the top two subscribing Witnesses. of the shield, the shield and Bunsen tube having enlargements that respectively bear JOSEPH LEDERER. 5 against the bridges to hold the parts in Witnesses:

place. WORTHING'I'ON CAMPBELL,

In testimony whereof I have signed my ISAAC B. OWENS.

topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. E. 

